Re: HARDWARE.TXT specific for Alpha?

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From
Warner Losh <imp@village.org>
Date
7 Jan 2000 13:29:34
Subject
Re: HARDWARE.TXT specific for Alpha?
Message-ID
200001072129.OAA88896@harmony.village.org

References to

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In message <Pine.BSF.4.10.10001070928460.83671-100000@iteso.mx> De la Cruz Lugo Eric writes:
: Thanks for the info, in X86 Architecture the RAM max size is 4 GB (check
: ftp.cdrom configuration :), i thinked that in Alpha should be bigger.

No. That's not right. PPro and newer support 36 bits of physical
address, which leads to a max size of 64G. The biggest Mobo I've seen
for x86 is 8GB (and that was second hand info about a micron server
mobo). FreeBSD can't go above 4G w/o rewriting all DMA customers to
use bus_dma, which are the network drivers iirc. The pmap layer would
also require a fair amount of work as well. But I drift from the
charter of this group now :-)

Warner


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